Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cceba835320baf0…

MALICIOUS

PDF

71.8 KB Created: 2021-04-11 06:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f0d72a3f8f99484f073b07879c25f3 SHA-1: 2efa1e595e2b9e7cee860d6194628ba97ee4ceca SHA-256: 5cceba835320baf0c8c421f0503417a490c4c5724a66b03d1c2f1255e9b1d212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are associated with SEO link farms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=speak+now+student+book+pdf
    • https://cdn.sqhk.co/zosurinipin/7jgijgg/welding_tanks_for_sale_craigslist.pdf
    • http://lofajemami.sportsontheweb.net/call_me_by_your_name_watch_online_reddit.pdf
    • https://tomoniwibisuxis.weebly.com/uploads/1/3/5/9/135961627/94840feaf0e9.pdf
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/jiwotonizejarifave.pdf
    • http://nujagexurej.medianewsonline.com/jupum.pdf
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/2404595.pdf
    • https://wigeludob.weebly.com/uploads/1/3/1/6/131636858/9904959.pdf
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/rurojob.pdf
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/dexesuk_boguxizivazujet_zopimozaro_fikumalewujival.pdf
    • https://cdn.sqhk.co/wijelukifap/5yjehaT/tubemate_youtube_video_downloader_online.pdf
    • https://cdn.sqhk.co/nujorazaje/VigRX0e/hindu_calendar_2020_thakur_prasad.pdf
    • https://cdn.sqhk.co/rorajakura/ja8pmih/80s_tamil_melody_songs_mp3_free_download.pdf
    • https://cdn.sqhk.co/digipexula/U56ieje/diwitasobisaxito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_a874f14996bf4f8a9cde21b58c609d49.pdf?index=true
    • https://s3.amazonaws.com/forupokisip/chess_pgn_meaning.pdf
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_e21da2803dca4954b7424fabbab7ab61.pdf?index=true
    • https://s3.amazonaws.com/wizomoravazub/background_powerpoint_cartoon.pdf
    • https://s3.amazonaws.com/nijosinizo/nowonazoxovof.pdf
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_8fe7af5d17c646abacbd38af9021adec.pdf?index=true
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_a804b855ad89498bae36167585a0802a.pdf?index=true
    • https://s3.amazonaws.com/woxojuxafopuv/tisof.pdf
    • http://gozudil.onlinewebshop.net/annual_return_gst.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9b.bin
fc9874420bfb70c77575a2111fcec86f5e8d052cfbdc1ec4b45bb6b9064008f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 5308 bytes
font_01_sfnt_off0000eed0.bin
55bec087e4d7ef5008f841c08375f955d36a76254e518e024e8439637c35e36f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10324 bytes

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